Material: These furniture leveling feet screws are made of metal and rubber material, more strength, longevity and corrosion resistance, anti-rust, the screw thread is deep so it wont slip easily when cleaning. rotation and not easy to fall off. No more scratches: This product has a round base, smooth surface without burrs, exquisite workmanship. Thick base, strong and stable, round rubber base that will not damage the floor. No SquealingThese leveling feet are the solution for uneven table legs, you can install them at the bottom of your product to stay balanced. They also provide sound dampening, your furniture will glide quietly and easily, no more squeaking. Height Adjustment: Using this product, you can adjust the height of the table and stool to your preference to meet your daily needs. The minimum height is 6mm and the maximum height is 23mm when installed. Product information: Made of metal and rubber material, good toughness, good choice to adjust the height of your chairs, tables or other furniture. It does not damage the floor and does not make noise during use. It can protect your furniture, no more scratches. Specifications: Quantity: 22 pieces. Materials: metal and rubber. Dimensions: M6 x 21 x 25 mm. Color: silver and black. Easy installation: 1. Accurately measure the diameter and mounting hole specifications of your product, then purchase the corresponding sizes. 2. If there is no mounting hole, please use the drill to make a hole of the same size as the screw of the leveling foot. Put a suitable leveling foot into the mounting hole, screw it the height you want. Tips: Since measurements are taken by hand, the sizes indicated may vary slightly. Thank you for your understanding. Please check the size before purchasing.